I suspect doctors simply don't receive much education in foods and supplements. They are more trained in meds. Years ago when I asked my doctor if I could substitute berberine for my metformin, he hadn't even heard of berberine. However, he checked it out and then approved of my switching. HOWEVER, we must remember that neither meds nor supplements allow us to eat whatever and how much we want without consequences! (Also, keep your doctor aware of what you're doing.)